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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'ee3e5c2c49018ff1b2e6ed7d2491c5a67e6e5596dd68b2ff628a96bd998bda6d' 
  AND token = 'l1NSGpGSpPKk0p3r6tMsVWFrDSCxDnJikS63SUmFhjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00748

JSON explain

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