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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4017232336b7e13bbff4f3f93e78626445eb420a9b4de9495c438d09cd48a2e3' 
  AND token = '75jAiAg74J6ZBexK5rXcMzANsIhIPTZ85mWIUpKC7Qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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