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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'ded172480138ef4ba8f7b1a3d15ba6a784dfb32011136500832c9a4fef9ea834' 
  AND token = '/S96mmvxQcE24ykIaVZtd/E82op+wA6bj0Q/VRx4tME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01497

JSON explain

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