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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1510973ebd82cb1f2ecf80d6d234fc00b9f24929c30f07305fe8456b67713b4a' 
  AND token = '/ByTOJfuVfxt+qDggTt5ckoSJ4jnfGWRaQ+I6qCgoQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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