Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4816a66db83ef33afbe2f4d20be0ac1003604e57d6e3c7d940a4eebc79c7aba5' 
  AND token = 'vKj8EHXLTYJ9I/V1Fn/rkSE0AJzD69vLdrWmEYnUE9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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