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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'cfe72d81d89d2df82ed4a0932497cf44bdb31312aa85b5099bac112f91a44e81' 
  AND token = '09YT5U6fO1tqB1UJ7tDluQjo8LAfCYsMe4baA2f87q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00880

JSON explain

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