SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '429d828881d84699d43bc55823f10e5cc077270f249791a0a59a44c85e13b912' 
  AND token = 'OmmBOSLprto6qh0PhnYRtv7git/ISoX60FURZGJk2pY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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