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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '2752ab6a568e1c2c50d358d7ae7ef14ec5217638e5ef1b38133eb7923edd9950' 
  AND token = 'DZNUQb58OPE3b01CnkcauymPuEwvN2hQEKFVPxopmfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00767

JSON explain

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