Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a47eaaead062b710b7fe75a33c0178694c60e45f6bce9838c5efcd773676b84' 
  AND token = 'lFXrsRXrR+NtQTTdabNAnxY30Gfo0g4xLuw1kZhABDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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