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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '063ed0e89db9fad6079acdca4e21c75548a377e2b97bc9f88eec34b21143d84c' 
  AND token = 'XTgpN5K5NeIIKQizykdc85kWeyqA815r8iE9v2q6sEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00946

JSON explain

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