Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '608c4befd9d1245e89efc557ebbd804ccee245d32e66fbe1bee0ccbf06740993' 
  AND token = 'X3kdlI3iRE0jh/jNGcPvTzySkni/MV6flwXwpGwbIRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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