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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4063949c7e06a3b436cc9dbe5825ffe3839e1df98a280d10b5a0d5125f7b2b22' 
  AND token = 'WlGqTtrPGjRlQL4V2HbeHr8s6/wQRr7NA4FcyCVuoiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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