SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f55e9e1b3c335656129273e13bbe3719f2d69977f2cdd60c0abf411c622266a' 
  AND token = 'AV2KdM1XWgmc7Wnuve7ZPTY/C/JDlGWRC+NDYgPe3xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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