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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f3976f3cdc159d1539885983fd7f42e5def28050edee309f4737ab2cd276a56' 
  AND token = '9RMt0tQD3qdMgQhdl/PLYJbQfwBpHkO/HXYd9D9APYo=' 
  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"
    }
  }
}