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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40be2aa42dc76b5e069fc967fe1a7d41a2bb5a24fc1885df8bc9d6ae6ac3bcec' 
  AND token = 'oHrhV39sBtWMfdgBJuyWT9QC6Ggl0FXVcvB3IxQGrRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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