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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cdb82bf2b1eb85e7979647cf5edb937e1a6f65d1df44c7956992a3421d2e9de' 
  AND token = 'pAjGkGz7VUuUMfy6i5bPncCIHf8eK9IwVzsUwlhXkWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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