SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38b42468a8addd4c98881c9bcb5fb603e329aca338210cda626e22f698e2fb45' 
  AND token = 'Sbt8lYKqGDWuhsJO0Lp/pglxw4IN9WJojyuBoDevnCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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