Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1de5bcb07a02a8e3c4b00654c4c831c7b8a496a660458193960e0aa3676c3e60' 
  AND token = 'PvFk3HdX8fqoM3qUtpXGeKmnVhvTUhevOUXAd1TtCT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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