Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '354bdc4594a2bf8ace75170bc95c1cdcc475d5f27932e43cbf01ce5140b44a78' 
  AND token = 'mTj3eDcxFDyeYvM4kVABHtYNXRiR5ySnPsAJHBejfG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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