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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'c488ba8359e8d07190179c1f25950e35338b0f65a446d4e3a43988f326bc2c40' 
  AND token = 'iB21xB9y0vvhJ8YlfdngHd8Xa0d8VI3DUnczUxjpbxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00757

JSON explain

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