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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d19f71db9d765bea7f32d1eaa5ef1c84127ac70b424e440c6a40f9d07d83f5' 
  AND token = 'voqBjGi4rXAQzV2uyF/OqEXPa9jPsJXr9iXezYi9Do0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}