Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '308feec127803f4821660127c3c37ece43d848cfed3df04aebc070d8fbaa74e3' 
  AND token = 'kM6u91S95578ovhp/ZY5clOMuRZgFLwNKULwmwfHehM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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