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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '29d41579ae8d4d3b5e8aedbb14f05113ae7a3ee2fb431dfc44bf2a65e2cdc06b' 
  AND token = 'kM6C04FYlLd7zqYNzxOvRQhzb2S4qVnv+QCrNqs6T58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00869

JSON explain

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