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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '203285e10d35a6e541da70b1793ccfe17c8bdb1fa5616ff90244ebbad41fbd06' 
  AND token = '4g6JPxn9e22HYukIrjhuC8kG9+EiisNLSC1+UzLpqEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00861

JSON explain

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