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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52c63b3b55640260e49a13f9302c794c91ec651adce44df2e8ff2d96c493c9c9' 
  AND token = '179+ZtTQ0euTqJcGVinJzKlJh3yH+vCkJ/ABDERUt1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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