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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a6327256096dc5b7fcf9b158446008aa0c7388b0f9e5169e9fbe9fb7532e37c' 
  AND token = 'yCbqzD0BgGdHn4d1dx00CBNcdiRd9Wy3XlEofYdl9oY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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