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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'c475d095c0270016a39b9953ffc3b971710825623b4f93af55ebe0f52bdd6b85' 
  AND token = 'Y+q8UIzjNcFi68eucWBWpyAmjiYNRDMBCW6CHym4OsI=' 
  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"
    }
  }
}