Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b52ed026d574fa68693b86ae198ae2e8247d5db6855eccdacd6c3cf0a2fa8afe' 
  AND token = 'oT6T6VnabB4dTEZA12XRY6EXyHpAWsFsFYYEdLtb9+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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