SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfea9bd989b31f34e8a76a7f55da9f403992b135f912f4a58cc1e72ec9f2d27b' 
  AND token = 'jVtz1K8Dh23PsIqZSsl7pdZmlY6/IfTqsDOUht8O+Ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00280

JSON explain

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