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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'fe3858e2336b5a4780201718dd912ec680fda13f0c455851596212af17dc5ff2' 
  AND token = 'SCtq2yRteTfOHxOFwvjyFRATAXOp+lHkXt1MY4V+aWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00816

JSON explain

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