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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fa5b8c19337f7e756eb39b6d8726819985c1b03814f54fce06e653bb1a41352' 
  AND token = 'fM52oWj9GUiEC+BtQ+SR7s35lgdWs+7WFk9R0EzTQTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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