Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b99a958d4dea4609805360fad4be842896b2f8cdf122783e901b66893a1e388a' 
  AND token = 'DvzJwqv2kfWC7DiG48+XDTXqgdsVajWIXEfLT9IAZNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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