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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6221522861f7315bf60a5481137e8405183dc4895bf0f46e38398050f9b91da9' 
  AND token = 'ai1yBGBWFIp2tWcdjaFnehieFuN1TxcR0YTP2yRC7a4=' 
  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"
    }
  }
}