SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4a13b5f96d96a5d50e61e331e2440a2cb1f86db573a106c076728d224772d95' 
  AND token = 'Gdz93B/PeKrwpHh/PUY2fwYpMCEx4VUPu8cm1Xh5AmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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