Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b617cf30a147b97d5a33baff38b2641f390124b3149dc2ef1d66fb59fa7cea8' 
  AND token = 'ANGy3efYFtNumZN1TyvLtrLisZiT5EFE5zOFN9r1xyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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