Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '870d1bfb4b884988366f33727f15dd3041df3129d701ef12d2e8e48a36a3f452' 
  AND token = 'iieCaYp5+p3V/1NpbdrIPBWD7OKpVxHiYy/2OLa4Nwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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