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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '621f2130638d7b3d74da868e66fcfddc6d2abb6bdd88e1dcab3b1d0a9e2e3764' 
  AND token = '307Ewse5NL5eYd2bZZiUKusa4EKQ8ue9XcfxNuhFpZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00955

JSON explain

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