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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'edaef48166c8127cdf9b8d7f7ba8754dc46a6a671317b279ee8eeb17cc044d81' 
  AND token = 'qgV6BN/ElE+wD9gwIb5mNBTweTZSYxn20WV0KDCeN58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00880

JSON explain

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