Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ca55a7bd7cfe4e5d48e6da9c18a8ab5afb8e5cc88bfb3815b95ed214072a77c' 
  AND token = 'EDq2f2J+TGymIZ4lIabMIfXHCH6aNKlaDYcUYnfQSFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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