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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3563c3e3af9bee13b57f5482e1fd14619b296a8df36e0adfc6c83a23a4e56efd' 
  AND token = '/6xh9N3c2W1t33t9HNlH3DV9GAGg6Odh5xurTba3alE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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