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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '197cff7653091ef18762daaecec61fb942d928473b2145b4d9edf49646a3f1f4' 
  AND token = '3jB+gWSdmiwGES+Kb1rXvjwbgnyP8geEi9Vzzy+c664=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01456

JSON explain

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