SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb88870b65cfe86ac3c0d7f7ea4ef363a74950fe154b0cb0dd8c9b7934986e2' 
  AND token = 'wKOPRF2XlftUZNh3gQ4R1IfegvjHVZmOhUjjgf/pqJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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