Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '512fc315dc2a6f0a723c928a83074340aae86ec57d57dc87ba7f7fe418aa97cf' 
  AND token = 'FlMCJcQYtiHN1oGwXbttGigmtmhyevkLxlRODpfjbaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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