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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bd6692484f6c977733ba072d85072c6903e4bfe86b70580d5afaa4a8b13639e' 
  AND token = 'AjW+LmvXu39oi9UQ0NeLS+XAx/um64lvcWjXu6vR4EM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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