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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cb6f12ea3b03fc880fd51da981292dc37fc26703c86bf955f7e2c1fbdf1e9ea' 
  AND token = 'GSovA+MKUT/Gx5os+X7hAJQ+e294NIvTkmY0MZHm1pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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