SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '961ba2ef663d9df56233f0fbfdb84b14853e30c22afd763e896ad4f09a270742' 
  AND token = '4kTWapXTRcRRXQ6vmEutzRvgQGCQhiNpVlzJZCgYFYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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