Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59a9567abdc072a8417fac5890e4535aa1fc0afc8c79e28b4c352a46beff1b09' 
  AND token = 'MEVUjQIOLAUOFFLInWXA+ssZA3rGuyuUepDtLuWR2BQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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