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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '278029f24b793acf4b1ef85e36c05e7306fe8379e59f6665d3e925861db96b9f' 
  AND token = 'TKzlH5nMzOvf5rxgML1K4rJicUPjCqCFO09ASfwuQTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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