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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd00c2ffa49d6d87610318465ca8a8c71f130afb6d25cfe5a6138cd639739c28' 
  AND token = 'UUC+TZ2hQmtq+1v5hXnHVqqeTVWMAce22QrF6DXb6hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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