Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6927beef6b01632cfd0ef264d65ffe227717b69f184ed49527eb8835f03d686' 
  AND token = 'YkM17wZdSzz7T6Et7nw3o05XTRswQsosUv+9o02Y4tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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