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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '3b2d07c9f2d0e35a700919dee9cb5f466e168319928a54d3e78b757a16a21d40' 
  AND token = '6bd4XRZ07xU9I/g2L1gsBII8OOczr6puKmliGM49s14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01280

JSON explain

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