SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e199b5a484b2d534fada976d25d9efbabf6e4c6462f5993678ece225b918984' 
  AND token = 'U/BGwuvZDrJ3yLtuZcRhuhOAss46/rLgn1MsHTDQr3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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