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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '625f3c774ce3711fe618adda979493a272f2ad52247031e4cf453dd86665e947' 
  AND token = '4SABRIG4+pLBfpXuT+9fV8icWlygWh2NwCzQtoW+IBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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