SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ba3f33db8e2b07c19e4ffd492187ce0966dc72834ac185cc0ba895616c499f2' 
  AND token = 'HqBgK1YJDy5WVuJ3g2MuyUzxVpc3o4KxRc7KHruvMOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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