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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60af5736232bcc1d4dc5c79d407324480df2cd9d7b9e7c3f316ea2d8f7ddcf10' 
  AND token = '1WbQBamLQiuehi+M6YOrlHb42+YS0P5a+BzAa0Ctnn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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