Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef7c5f69df5a50a7321d65a011a1be20929698ad486c1ef174d86f9882bc0814' 
  AND token = 'MtLFKuA0InrrdP8WOeq9n+zPMq0p8B131AnvgXb7GQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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