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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eb857054f810ad126d13b3a92d121adb12b47d3d6c51e145134c0f3da0be0bf' 
  AND token = '25Jdrr2JHnOV+IXs06ZnGyTexYw1un3zUbKrSr4GiGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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