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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '8ed26ed36d8f2822e8e378c75e03523299f20f966386a6e1098ab748d6b129a3' 
  AND token = '0oVB425W8gCotDDJE6/Mu2SQxPAvyVDxIXI5l2urgUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00788

JSON explain

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