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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'ee40d3c9211e0b314e111e87253ee285cb03d049122f52ea99192059614c6192' 
  AND token = 'Ab8VNcZ5f0WeOV8EUVJqbN96lCOmcJLiUwXr0+sjews=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00954

JSON explain

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