Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936574fb0417178e1eebf2009da558b3c1058f679ea14d085e8a61ead514794a' 
  AND token = 'nAR8GsEPNgI6JGNRzfD8bhQXue/RFWl1Qq41MiHbQDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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