SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '465ae00899609fb7fc933e90fad707a41b2af342582e5cd38de2b1feac066267' 
  AND token = 'GmZ4qnlbFakDRsNXAyoJ1OVhyZi1/H/CGptwOM8YY7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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