SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '862b7b9b3f6ae9bd8ed1877d141b3d3027fec245ebfe3e0221bbc6318c7874e5' 
  AND token = 'ZG+XMZJVKX3CS8YpB/Zup6Fv5GdspT3y2xPgwOqcjiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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