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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37c3d3a7e1e100ad891adb62e1a66bbd8ffd2c4960d84d87522c5c6e7329abcf' 
  AND token = 'Umdx8/wOdfgie7dTImozQ3RyMU6HTIR12lCS8OSnoR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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