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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'a9694b96de573889cf9f9015131322b4c048516d625c07d15a3e33c03c19d02c' 
  AND token = 'IceHlrCAVSaSfJ8SNqcPvRtWeUxYu22SQUQVatiMGFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00752

JSON explain

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