Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad60c28a78007ba00a1edcbaafcfe9bd3fc985836a0524f975df19f41bcc3094' 
  AND token = 'urPeOKbQjrXM1+v/tFTLk+Ffa6b2ZK98AwqtuLRim7U=' 
  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"
    }
  }
}