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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b67b047f93881501e433370e9905a6faa4e1d03e442544f672a3f76eab94f9d7' 
  AND token = 'QE7vvuUp9IWh2kkcR5sR9NolTy6iK9RoM87ciEBfcos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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