Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5f2016edf4da111a2e0dda302d082f7a76d08f6fb0defbb5f6fc007096b32b7' 
  AND token = 'J3tZXzhEXq7s1AfkXT0baxlAe4FAy0tzHQoRe5+82nM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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