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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3857a94fa6f632e9f04dc1b543e3857e4db1dcce7338f1b9a166611f4c2aabeb' 
  AND token = 'HuQduwGbKlEvAxJOmGW7tLe0q4nQQWsGx6S2ywxbD3c=' 
  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"
    }
  }
}