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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'b6f9076e1028205bb38f33a0661627b274d0c5e02b64f8f1a9cae29d882527ab' 
  AND token = 'dD8DBBQvnQg2TQ3K292clZCAxO0OnDbVSnnApY96M/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00751

JSON explain

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