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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '15ff6551de5d717806f1e1d3a6ed98f9c9f708309f5ca376ffcb1597f5951771' 
  AND token = 'nwnaXhe5AujmXje0pgEvWNvkOwhgQct6CmqmonhxzPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00770

JSON explain

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