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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '170bd5a16a74a9e230b57fab853a495528bf0dc2d20c186b40d783ede36b0f1b' 
  AND token = 'ysM10hqoz+5pJJUGWDLtd2kBD3rmBdVbNT7Togz0VyU=' 
  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"
    }
  }
}