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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '376e66e77a69255ac442b7d7c4d3a43095bc2b9b46fb51a5b180b0adddc20e9c' 
  AND token = 'CvpXOQo+xhuUNu4N/XRMhyd3Y7pBcXNEh9Ojm/V8NRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00759

JSON explain

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