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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dedad447855d7b55719f49d58285a177b5e56c1efb9076148e447e5aa8947e61' 
  AND token = '7U7HRLj+geCyhlcXn2uBL7XaQxysKk6eewtlTMHFsqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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