SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14ef6c183591fd6f3bf51fbb6d25297c0a3fd16f12bbc96c0b348288e17f7fc0' 
  AND token = 'Vcz5gYbDNWPqjWj4hoqV/VvoDFOUAN4yA9g7tkK9Z64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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