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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee7bd11ba77ba96521ab9cf99ed2d3b5d334e031b9c86205ee2d31ca9f189748' 
  AND token = 'IHm4wrVsw6YytFqN4FWOMqa1mLOVTabGVsEC362YQIA=' 
  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"
    }
  }
}