Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aae861b40ec4d961f03a74c2ea25c50cd425239de1fa9211242d5c7a07f0ade' 
  AND token = 'I8HLYMncI1uBfaJSa1ulUTTZt62JfEjqpINnlH9NNso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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