SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b93a1bf0fa1e31622428b56fc1b5b8944b8b76662a85a734c770512529ee991' 
  AND token = 'hVyrO4GhYTOr8PMwZXKu3QQ8E0ls72B5Dm/YK3/Zaes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00409

JSON explain

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