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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0ea2971e3f0aaed36ff5b7c147a9d33b1f5aab62060a051b80e07c8c2baae2e' 
  AND token = 'sYcWDEJULw9XGOqeUUpWGWS0lW1lZDgc//yw7sROp9I=' 
  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"
    }
  }
}