Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ab40a753eab899e113022ba009cdd324f86c7c83544d1a0ffe15846a5f1a2b' 
  AND token = 'Ns0kjo8qLQvPXBXhY5T40FIt4q5EWdXXglz7Yn17Yt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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