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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'bb0b38451b5d7a1a0c69022d2251532dff8eb4a4baecbf84789fef58722490f1' 
  AND token = 'S3Vh7ZGeb7XY24SHHDY6NNiTcInagXMhl4lNpFyXmSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00789

JSON explain

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