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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '1addb9f2b00b8c9a4cc1eb3aa2314c435d22901659f6e9e5ed861cfe2daecd60' 
  AND token = 'Cj4Pk5XhovxiXzfrKsaOrg/kD4g9QbiqxRCzXu5aCXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00786

JSON explain

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