Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dcbabdef9085fc420e75678c53d762b206ec557a08b9f7db6dcfe403f2c0eea' 
  AND token = 'MLi/ljrcsAgQ20g6kjNRWW9uqqt27vPYKrIzRRJpRgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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