SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd88641f49df80556da460b5aefa8a1aa892fff3640e94eb7a84f582779cbe51d' 
  AND token = 'uYfXSaIzmjkn/UMZIgtf9nFYlZzyuTbFpxH2v/lV+hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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