Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b83c0d60769e9c6feb0f5a49dffa44e6415263585df5b0a04c1fb69a2ae2dd1a' 
  AND token = 'FjoTT7/hx8byISWaAnmcvpUHCgJ1vGxA2QXaK7fr8jE=' 
  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"
    }
  }
}