Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5809c56a5cb98b1c72dfd77238660cd9ba5e3afef6a1e4371aefef1d2bd27e83' 
  AND token = 'ysJUk5YZ0NQBNqnBUIYxsYrgZDTRXMCjNy7r4NiESjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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