SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce4a8347d53479be8e834617380f2f9c28e9250df2dd3d98b1e1444d9f52380f' 
  AND token = 'h+BObBR5o23yfHL6CBwrqOZ1GWvPlCgw1NtqzXLRphI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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