Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f29bd31874d7f33207dac49a527acdf46f2ce0e923cbdff263938fd7fa6c9b6d' 
  AND token = 'AISCDabmBtxCiQuBfF3kxzHiOvNelxqcQajLlE4cxRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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