Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e35a2eef1698f5820e4d146e2f7626dc0a235970e5649eb5fc2231505f2eb4f0' 
  AND token = 'NPqF+i26CGKF6rwrPLWIs+9Fyhp9Hhs8fddlNveNA3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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