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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'f607f2ede8f4c5620b3b0651a2cc8893fe793d5ec0f5e19ed93960d56f5aa6b4' 
  AND token = 'rRgjLyq4rZe1JU5u1iWYBUf0P7jIf8FHFzP078QZlBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00750

JSON explain

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