Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac139cf04b9ac02ec576dbe913611ccdce9c0036b8ccea2d9d544f4665ad615f' 
  AND token = 'L1OuDXQR/5y9O6+b4JQP1dk5Rfdc8JoSh1hDfmhirbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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