SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17511fa23f5f4436c00ffc3a68a458c7458fb8279aa8441ec073f9544256b02a' 
  AND token = '8Oi0ABYqnHpqMRbY7GCLAntXMXOvhxulfkWvzqnhGkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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