Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb43ab19cd306f7eb0417e0c637270d08821feb50fb1168a02a2321a1f548b61' 
  AND token = '/gMV6/eF0/BGHReXs7+GygFnvjCt/Gue7mniSsm1S0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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