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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '29688c145d4ede2f5edbcb3ee6761245955f2de7d63e3b5c932a63748de3f1e6' 
  AND token = 'epnbDfYX4hQq1m7FH6UZR45CT7w2OdLe9WTqBJWSYoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01067

JSON explain

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