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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '241eaf74a20535f3cec0461d138381c6f2b0154231b66c5cf2c434f5b32164a9' 
  AND token = 'lw1IWM56bOsyd3KrjYsNSWoUvwnpxaO9swZqiNVajMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00886

JSON explain

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