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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '6c98401f0e3115efe29aef82f38b56ec9736fd5995e10d51e3f0e714e59314bd' 
  AND token = 'R5ZVun68z3WbcdEveWqzj4NrQztU/FkZzjO/N4KnuZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00921

JSON explain

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