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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '69af1588ad96d9dd1b1e2d7863a934a398be9909d73d87fca35d57a0426f0c7a' 
  AND token = 'd7qKjLb0dvjqSWB7NJSYqjAiHzG3rF4awijFjtqEx/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00868

JSON explain

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