Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cae9fc79513a0912acf3410bf050890f79b46745d3d734c5b6dad9d3437a668' 
  AND token = 'xlS3XszQp+7HFMwttBQIlqRiOu8mg79IbRz3FQBcMrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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