SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66028b2426bedffc6b17bec8ce7836f8c1841d02c61e58efcc05ebb8799c5b47' 
  AND token = '6vN6vMOezhxKu4Pq9S5IZuJaYBCBNU7yZshjkHganog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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