Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b88dc62a945a7da3456163968a84a4db06a429f3ea082c0e7b14c747371789da' 
  AND token = 's86Eq1BMdMUPRU/XW2d8cf0x9XoCA+cKKjLw6+KGyCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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