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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df6d62d657e1f2aac8a80cb3e575c4dcfb69d311d6fe227fdbcc30aa72277641' 
  AND token = 'xnAHhVrMcgYgqwrusj1tTd/XZ8UMMEQGyoVp4gPU3d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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