Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c781b1d797eb4adc158538372a1474ff1cb9a92cb4b3855949fe536b649a266' 
  AND token = 'V29RLVy376kFwLErHgbigv805nXd308aWuVVMz/3Tt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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