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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '170b8b9574511431b96ace01055369e51df194a821524c9f7b0e91dfbbc5fcea' 
  AND token = 'fKOpGGUemeVSJMXmchvbCfuhhrnqHiQuOaBiIbfx7aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00801

JSON explain

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