SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e5e411c89d884b2ff1c720c479db02866f2f7753cbc6923477309d68e84b755' 
  AND token = 'trPFmaOfj8HWALqn8sn8CuioT4KUJYS+qw/URQ+MfuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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