Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5acb11c7491044690415fe2d09659d03b936fb9fccee0705ccd7f2edd5f89bd6' 
  AND token = 'SV6tVxXfdOKlTqFM18vrFtWrVJRT6W7Trnr+dpe4dO4=' 
  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"
    }
  }
}