Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa75d70b16596d72eff9a8e69ed15c851d70c10167bb9a73f580a5fca304465d' 
  AND token = 'zNcvFiyqm25wo7ZhhxAuR+i1nK4BcmCaXliqoDK6U60=' 
  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"
    }
  }
}