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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'a4785cb8d2c2df20f9f898296f3cfc52e1e36fa191c2c49cec7e5b71c3492ca6' 
  AND token = 'uufQmwwc8wM9HJeqDSfH8iJhuN77+tinHZi8HnwtkCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00865

JSON explain

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