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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e38703acae6e8b4821838905eb6fbe31ebb0d940cd8d3d67737e737d3407de6f' 
  AND token = 'XPSB5d4xkraFWX/FX0RtsWt49P/oxrPRWWuJQORz718=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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